When we reached Washington I could see the three great steel towers at Arlington looming up as high, it seemed to me, as the Washington Monument itself. On reaching the Arlington station which sets on the crest of a hill in a corner of the Fort Myer Reservation, the towers did not look so high, nor were they, for the tallest one was about 600 feet and the two shorter ones were 450 feet high. These three towers formed a triangle, the distance between the two shorter ones being 350 feet, and 450 feet between the taller and shorter ones. These towers, which were complete and ready for the aerials, rested on concrete buses and were insulated from the ground by slabs of marble. There are three buildings and these were also ready for the installation. Now while the machinery and apparatus were being moved into the buildings and set in place a force of men was put to work on assembling the aerials and swinging them between the tops of the towers. These aerials are known as T, or flat-top aerials and right here I want to tell you how and why this type of aerial came to be. In the early days Marconi, and those who followed him, thought that a high vertical wire, that is, one sticking straight up in the air, was all that was needed to get distance. On ships the masts are never very high and so the late Lieutenant Hudgens of the U. S. Navy tried stringing the wires of the aerial down to the bow and stern of the battleship _Kearsarge_ to give the wires a greater length. This sloping aerial gave so much better results than the straight, or vertical aerial that he then suspended the wires _between_ the top of the masts of the ship and, lo-and-behold, it worked even better than before and thus it was that the T, or flat-top aerial came to be. To get the best results the aerials of two stations communicating with each other should both be vertical or flat-top, that is, a vertical wire will not receive from a flat-top nearly as well as from another one that is vertical and this is just as true the other way about. As all ships are fitted with flat-top aerials and as the Eiffel Tower aerial is neither the one kind nor the other but a sloping aerial and hence would receive from a flat-top as well as from a vertical aerial the Navy Department decided to use the T or flat-top aerial on the Arlington station. We assembled, tested and put up the three flat-top aerials between the towers and connected them together so that in effect a single long aerial was formed. Porcelain insulators of the kind on which high tension power transmission lines are carried are used to insulate the aerials from the towers. The leading-in cable runs from the aerials to which it is connected down to the operating room through a copper tube set in a glass window. The ground is formed of copper wires buried deeply in the earth and radiating in every direction from the station. This network of wires extends over, I should say, ten acres, and this, of course, makes a very good ground.